Is there feedback control
over any of FLIR`s Pan-Tilt systems?

All of FLIR`s Pan-Tilt Units (PTUs) can be queried at any time
for speed and position of both axes. The E Series units (D48E, D100E,
and D300E) have incremental encoders on the motors, which check that
the motor is in synchrony. The other models (E46, D47, as well as the
legacy D46) are open loop control only -- but as long as the
application is appropriately sized, losing steps should not be an issue.